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Aquat Toxicol

Title:		Effect of allelochemicals on photosynthetic and antioxidant defense system of Ulva prolifera
Author(s):		Li N; Tong M; Glibert PM;
Address:		"Ocean College, Zhejiang University, Zhoushan, 316021, China. Ocean College, Zhejiang University, Zhoushan, 316021, China. Electronic address: mengmengtong@zju.edu.cn. University of Maryland Center for Environment Science, Horn Point Laboratory, Cambridge, MD, 21613, USA"
Journal Title:		Aquat Toxicol
Year:		2020
Volume:		20200516
Issue:
Page Number:		105513 -
DOI:		10.1016/j.aquatox.2020.105513
ISSN/ISBN:		1879-1514 (Electronic) 0166-445X (Linking)
Abstract:		"Ulva prolifera is a macroalgae that forms massive blooms, negatively impacting natural communities, aquaculture operations and recreation. The effects of the natural products, eugenol, beta-myrcene, citral and nonanoic acid on the growth rate, antioxidative defense system and photosynthesis of Ulva prolifera were investigated as a possible control strategy for this harmful taxon. Negative effects on growth were observed with all four chemicals, due to the excessive production of reactive oxygen species and oxidative damage to the thalli. However, the response of U. prolifera under the four chemicals stress was different at the cellular level. beta-myrcene, the most effective compound in terms of growth inhibition, induced oxidative stress as shown by the damage of total antioxidant capacity (T-AOC) and the downregulation of the glutathione-ascorbate (GSH-ASA) cycle which inhibited the antioxidative system. This chemical also inhibited photosynthesis and photoprotection mechanisms in U. prolifera, resulting in growth limitation. In contrast, U. prolifera was less affected by the second tested chemical, eugenol, and showed no significant change on photosynthetic efficiency in the presence of the chemical. The inhibition effects of the third and fourth tested chemicals, nonanoic acid and citralon, on growth and on the antioxidant defense system in U. prolifera were inferior. These results provide a potential avenue for controlling green tides in the future"
Keywords:		"Antioxidants/*metabolism Oxidative Stress/drug effects Pheromones/*toxicity Photosynthesis/*drug effects/physiology Seaweed/*drug effects/metabolism/physiology Ulva/*drug effects/growth & development/metabolism Water Pollutants, Chemical/*toxicity Allelop;"
Notes:		"MedlineLi, Naicheng Tong, Mengmeng Glibert, Patricia M eng Netherlands 2020/06/07 Aquat Toxicol. 2020 Jul; 224:105513. doi: 10.1016/j.aquatox.2020.105513. Epub 2020 May 16"